Date.prototype.format = function(format) {
	var o = {
		"M+" : this.getMonth()+1, //month
		"d+" : this.getDate(),    //day
		"h+" : this.getHours(),   //hour
		"m+" : this.getMinutes(), //minute
		"s+" : this.getSeconds(), //second
		"q+" : Math.floor((this.getMonth()+3)/3), //quarter
		"S" : this.getMilliseconds() //millisecond  
	};
	
	if(/(y+)/.test(format)) 
		format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));
	
	for(var k in o) {
		if(new RegExp("("+ k +")").test(format))  
			format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] :("00"+ o[k]).substr((""+ o[k]).length));
	}
		
	return format;
};